expending vs expenditure

expending and expenditure both are nouns.

Word	Noun	Adjective	Verb	Adverb
expending	Yes	No	No	No
expenditure	Yes	No	No	No

As nouns, expending and expenditure are synonyms defined as:

expending and expenditure: the act of spending money for goods or services

expending (noun)	expenditure (noun)
the act of spending money for goods or services	the act of spending money for goods or services
	the act of consuming something
	money paid out; an amount spent